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Find the unknown.$$5 x^{2}-7=2 x^{2}+20$$

$$\pm 3$$

Algebra

Chapter 0

Reviewing the Basics

Section 2

Solving Equations of the Form $a x^{2}-b=0$

Equations and Inequalities

McMaster University

Harvey Mudd College

Baylor University

Idaho State University

Lectures

01:09

Find the unknown.$$17 …

01:45

Find the unknown.$$(5 …

00:42

Find the unknown.$$x^{…

00:32

01:54

Find the unknown.$$(4 …

01:24

Find the unknown.$$(x+…

01:57

Find the unknown.$$(3 …

01:11

01:06

02:21

Solve :$$(x-5)^{2}=(x+7)^{…

04:25

Solve or simplify, whichev…

02:36

Solve.$$2\left(x^{2}-5…

02:16

01:34

$$2 x^{2}-7 x+5$$<…

00:45

Subtract$\left(2 x^{2}…

02:54

Divide.$$\left(2 x^{3}…

Hey, it's Claressa with Neighboring Fair. So here in this equation, we're going to find for X and we want Thio Isolate X square on one side and the numerical value for the other to solve for X. So first, we're going to subtract two x square. What you do on one side, you always due to the other. So we get three X square minus seven. This cancels out so we get equal to 20 and now we're going to add seven. But and we get three. X square is equal to 27 and we know that three. We could divide three on both sides. So you get X Square is equal to nine. Next becomes positive, negative.

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